/*
- * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <config.h>
#include "socket-util.h"
+#include <sys/types.h>
+#include <netinet/in.h>
#include <arpa/inet.h>
+#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netdb.h>
+#include <netinet/tcp.h>
#include <poll.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/uio.h>
#include <sys/un.h>
#include <unistd.h>
-#include "dynamic-string.h"
-#include "fatal-signal.h"
+#include "openvswitch/dynamic-string.h"
+#include "ovs-thread.h"
#include "packets.h"
+#include "openvswitch/poll-loop.h"
#include "util.h"
-#include "vlog.h"
-#if AF_PACKET && __linux__
+#include "openvswitch/vlog.h"
+#ifdef __linux__
#include <linux/if_packet.h>
#endif
#ifdef HAVE_NETLINK
#include "netlink-protocol.h"
#include "netlink-socket.h"
#endif
+#include "dns-resolve.h"
VLOG_DEFINE_THIS_MODULE(socket_util);
-/* #ifdefs make it a pain to maintain code: you have to try to build both ways.
- * Thus, this file compiles all of the code regardless of the target, by
- * writing "if (LINUX)" instead of "#ifdef __linux__". */
-#ifdef __linux__
-#define LINUX 1
-#else
-#define LINUX 0
-#endif
-
-#ifndef O_DIRECTORY
-#define O_DIRECTORY 0
-#endif
+static int getsockopt_int(int fd, int level, int option, const char *optname,
+ int *valuep);
+static struct sockaddr_in *sin_cast(const struct sockaddr *);
+static struct sockaddr_in6 *sin6_cast(const struct sockaddr *);
+static const struct sockaddr *sa_cast(const struct sockaddr_storage *);
+static bool parse_sockaddr_components(struct sockaddr_storage *ss,
+ char *host_s,
+ const char *port_s,
+ uint16_t default_port,
+ const char *s,
+ bool resolve_host);
/* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a
* positive errno value. */
int
set_nonblocking(int fd)
{
+#ifndef _WIN32
int flags = fcntl(fd, F_GETFL, 0);
if (flags != -1) {
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != -1) {
return 0;
} else {
- VLOG_ERR("fcntl(F_SETFL) failed: %s", strerror(errno));
+ VLOG_ERR("fcntl(F_SETFL) failed: %s", ovs_strerror(errno));
return errno;
}
} else {
- VLOG_ERR("fcntl(F_GETFL) failed: %s", strerror(errno));
+ VLOG_ERR("fcntl(F_GETFL) failed: %s", ovs_strerror(errno));
return errno;
}
+#else
+ unsigned long arg = 1;
+ if (ioctlsocket(fd, FIONBIO, &arg)) {
+ int error = sock_errno();
+ VLOG_ERR("set_nonblocking failed: %s", sock_strerror(error));
+ return error;
+ }
+ return 0;
+#endif
}
-static bool
-rlim_is_finite(rlim_t limit)
+void
+xset_nonblocking(int fd)
{
- if (limit == RLIM_INFINITY) {
- return false;
+ if (set_nonblocking(fd)) {
+ exit(EXIT_FAILURE);
}
+}
-#ifdef RLIM_SAVED_CUR /* FreeBSD 8.0 lacks RLIM_SAVED_CUR. */
- if (limit == RLIM_SAVED_CUR) {
- return false;
+void
+setsockopt_tcp_nodelay(int fd)
+{
+ int on = 1;
+ int retval;
+
+ retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
+ if (retval) {
+ retval = sock_errno();
+ VLOG_ERR("setsockopt(TCP_NODELAY): %s", sock_strerror(retval));
}
+}
+
+/* Sets the DSCP value of socket 'fd' to 'dscp', which must be 63 or less.
+ * 'family' must indicate the socket's address family (AF_INET or AF_INET6, to
+ * do anything useful). */
+int
+set_dscp(int fd, int family, uint8_t dscp)
+{
+ int retval;
+ int val;
+
+#ifdef _WIN32
+ /* XXX: Consider using QoS2 APIs for Windows to set dscp. */
+ return 0;
#endif
-#ifdef RLIM_SAVED_MAX /* FreeBSD 8.0 lacks RLIM_SAVED_MAX. */
- if (limit == RLIM_SAVED_MAX) {
- return false;
+ if (dscp > 63) {
+ return EINVAL;
}
-#endif
+ val = dscp << 2;
- return true;
+ switch (family) {
+ case AF_INET:
+ retval = setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val);
+ break;
+
+ case AF_INET6:
+ retval = setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &val, sizeof val);
+ break;
+
+ default:
+ return ENOPROTOOPT;
+ }
+
+ return retval ? sock_errno() : 0;
}
-/* Returns the maximum valid FD value, plus 1. */
-int
-get_max_fds(void)
+/* Checks whether 'host_name' is an IPv4 or IPv6 address. It is assumed
+ * that 'host_name' is valid. Returns false if it is IPv4 address, true if
+ * it is IPv6 address. */
+bool
+addr_is_ipv6(const char *host_name)
{
- static int max_fds = -1;
- if (max_fds < 0) {
- struct rlimit r;
- if (!getrlimit(RLIMIT_NOFILE, &r) && rlim_is_finite(r.rlim_cur)) {
- max_fds = r.rlim_cur;
- } else {
- VLOG_WARN("failed to obtain fd limit, defaulting to 1024");
- max_fds = 1024;
- }
- }
- return max_fds;
+ return strchr(host_name, ':') != NULL;
}
/* Translates 'host_name', which must be a string representation of an IP
int
lookup_ip(const char *host_name, struct in_addr *addr)
{
- if (!inet_aton(host_name, addr)) {
+ if (!ip_parse(host_name, &addr->s_addr)) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "\"%s\" is not a valid IP address", host_name);
return ENOENT;
int
lookup_ipv6(const char *host_name, struct in6_addr *addr)
{
- if (inet_pton(AF_INET6, host_name, addr) != 1) {
+ if (!ipv6_parse(host_name, addr)) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "\"%s\" is not a valid IPv6 address", host_name);
return ENOENT;
* successful, otherwise a positive errno value.
*
* Most Open vSwitch code should not use this because it causes deadlocks:
- * gethostbyname() sends out a DNS request but that starts a new flow for which
+ * getaddrinfo() sends out a DNS request but that starts a new flow for which
* OVS must set up a flow, but it can't because it's waiting for a DNS reply.
- * The synchronous lookup also delays other activty. (Of course we can solve
+ * The synchronous lookup also delays other activity. (Of course we can solve
* this but it doesn't seem worthwhile quite yet.) */
int
lookup_hostname(const char *host_name, struct in_addr *addr)
{
- struct hostent *h;
+ struct addrinfo *result;
+ struct addrinfo hints;
- if (inet_aton(host_name, addr)) {
+ if (ip_parse(host_name, &addr->s_addr)) {
return 0;
}
- h = gethostbyname(host_name);
- if (h) {
- *addr = *(struct in_addr *) h->h_addr;
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = AF_INET;
+
+ switch (getaddrinfo(host_name, NULL, &hints, &result)) {
+ case 0:
+ *addr = ALIGNED_CAST(struct sockaddr_in *,
+ result->ai_addr)->sin_addr;
+ freeaddrinfo(result);
return 0;
- }
- return (h_errno == HOST_NOT_FOUND ? ENOENT
- : h_errno == TRY_AGAIN ? EAGAIN
- : h_errno == NO_RECOVERY ? EIO
- : h_errno == NO_ADDRESS ? ENXIO
- : EINVAL);
-}
+#ifdef EAI_ADDRFAMILY
+ case EAI_ADDRFAMILY:
+#endif
+ case EAI_NONAME:
+ case EAI_SERVICE:
+ return ENOENT;
-/* Returns the error condition associated with socket 'fd' and resets the
- * socket's error status. */
-int
-get_socket_error(int fd)
-{
- int error;
- socklen_t len = sizeof(error);
- if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- error = errno;
- VLOG_ERR_RL(&rl, "getsockopt(SO_ERROR): %s", strerror(error));
+ case EAI_AGAIN:
+ return EAGAIN;
+
+ case EAI_BADFLAGS:
+ case EAI_FAMILY:
+ case EAI_SOCKTYPE:
+ return EINVAL;
+
+ case EAI_FAIL:
+ return EIO;
+
+ case EAI_MEMORY:
+ return ENOMEM;
+
+#if defined (EAI_NODATA) && EAI_NODATA != EAI_NONAME
+ case EAI_NODATA:
+ return ENXIO;
+#endif
+
+#ifdef EAI_SYSTEM
+ case EAI_SYSTEM:
+ return sock_errno();
+#endif
+
+ default:
+ return EPROTO;
}
- return error;
}
int
check_connection_completion(int fd)
{
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
struct pollfd pfd;
int retval;
pfd.fd = fd;
pfd.events = POLLOUT;
+
+#ifndef _WIN32
do {
retval = poll(&pfd, 1, 0);
} while (retval < 0 && errno == EINTR);
+#else
+ fd_set wrset, exset;
+ FD_ZERO(&wrset);
+ FD_ZERO(&exset);
+ FD_SET(fd, &exset);
+ FD_SET(fd, &wrset);
+ pfd.revents = 0;
+ struct timeval tv = { 0, 0 };
+ /* WSAPoll is broken on Windows, instead do a select */
+ retval = select(0, NULL, &wrset, &exset, &tv);
if (retval == 1) {
- return get_socket_error(fd);
+ if (FD_ISSET(fd, &wrset)) {
+ pfd.revents |= pfd.events;
+ }
+ if (FD_ISSET(fd, &exset)) {
+ pfd.revents |= POLLERR;
+ }
+ }
+#endif
+ if (retval == 1) {
+ if (pfd.revents & (POLLERR | POLLHUP)) {
+ ssize_t n = send(fd, "", 1, 0);
+ if (n < 0) {
+ return sock_errno();
+ } else {
+ VLOG_ERR_RL(&rl, "poll return POLLERR but send succeeded");
+ return EPROTO;
+ }
+ }
+ return 0;
} else if (retval < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- VLOG_ERR_RL(&rl, "poll: %s", strerror(errno));
+ VLOG_ERR_RL(&rl, "poll: %s", sock_strerror(sock_errno()));
return errno;
} else {
return EAGAIN;
}
}
-/* Drain all the data currently in the receive queue of a datagram socket (and
- * possibly additional data). There is no way to know how many packets are in
- * the receive queue, but we do know that the total number of bytes queued does
- * not exceed the receive buffer size, so we pull packets until none are left
- * or we've read that many bytes. */
+/* Returns the size of socket 'sock''s receive buffer (SO_RCVBUF), or a
+ * negative errno value if an error occurs. */
int
-drain_rcvbuf(int fd)
+get_socket_rcvbuf(int sock)
{
- socklen_t rcvbuf_len;
- size_t rcvbuf;
+ int rcvbuf;
+ int error;
- rcvbuf_len = sizeof rcvbuf;
- if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- VLOG_ERR_RL(&rl, "getsockopt(SO_RCVBUF) failed: %s", strerror(errno));
- return errno;
- }
- while (rcvbuf > 0) {
- /* In Linux, specifying MSG_TRUNC in the flags argument causes the
- * datagram length to be returned, even if that is longer than the
- * buffer provided. Thus, we can use a 1-byte buffer to discard the
- * incoming datagram and still be able to account how many bytes were
- * removed from the receive buffer.
- *
- * On other Unix-like OSes, MSG_TRUNC has no effect in the flags
- * argument. */
- char buffer[LINUX ? 1 : 2048];
- ssize_t n_bytes = recv(fd, buffer, sizeof buffer,
- MSG_TRUNC | MSG_DONTWAIT);
- if (n_bytes <= 0 || n_bytes >= rcvbuf) {
- break;
- }
- rcvbuf -= n_bytes;
- }
- return 0;
+ error = getsockopt_int(sock, SOL_SOCKET, SO_RCVBUF, "SO_RCVBUF", &rcvbuf);
+ return error ? -error : rcvbuf;
}
/* Reads and discards up to 'n' datagrams from 'fd', stopping as soon as no
}
}
-/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
- * '*un_len' the size of the sockaddr_un. */
-static void
-make_sockaddr_un__(const char *name, struct sockaddr_un *un, socklen_t *un_len)
+ovs_be32
+guess_netmask(ovs_be32 ip_)
{
- un->sun_family = AF_UNIX;
- ovs_strzcpy(un->sun_path, name, sizeof un->sun_path);
- *un_len = (offsetof(struct sockaddr_un, sun_path)
- + strlen (un->sun_path) + 1);
+ uint32_t ip = ntohl(ip_);
+ return ((ip >> 31) == 0 ? htonl(0xff000000) /* Class A */
+ : (ip >> 30) == 2 ? htonl(0xffff0000) /* Class B */
+ : (ip >> 29) == 6 ? htonl(0xffffff00) /* Class C */
+ : htonl(0)); /* ??? */
}
-/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
- * '*un_len' the size of the sockaddr_un.
- *
- * Returns 0 on success, otherwise a positive errno value. On success,
- * '*dirfdp' is either -1 or a nonnegative file descriptor that the caller
- * should close after using '*un' to bind or connect. On failure, '*dirfdp' is
- * -1. */
-static int
-make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len,
- int *dirfdp)
-{
- enum { MAX_UN_LEN = sizeof un->sun_path - 1 };
-
- *dirfdp = -1;
- if (strlen(name) > MAX_UN_LEN) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
-
- if (LINUX) {
- /* 'name' is too long to fit in a sockaddr_un, but we have a
- * workaround for that on Linux: shorten it by opening a file
- * descriptor for the directory part of the name and indirecting
- * through /proc/self/fd/<dirfd>/<basename>. */
- char *dir, *base;
- char *short_name;
- int dirfd;
-
- dir = dir_name(name);
- base = base_name(name);
-
- dirfd = open(dir, O_DIRECTORY | O_RDONLY);
- if (dirfd < 0) {
- free(base);
- free(dir);
- return errno;
- }
-
- short_name = xasprintf("/proc/self/fd/%d/%s", dirfd, base);
- free(dir);
- free(base);
+static char *
+unbracket(char *s)
+{
+ if (*s == '[') {
+ s++;
- if (strlen(short_name) <= MAX_UN_LEN) {
- make_sockaddr_un__(short_name, un, un_len);
- free(short_name);
- *dirfdp = dirfd;
- return 0;
- }
- free(short_name);
- close(dirfd);
+ char *end = strchr(s, '\0');
+ if (end[-1] == ']') {
+ end[-1] = '\0';
+ }
+ }
+ return s;
+}
- VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
- "%d bytes (even shortened)", name, MAX_UN_LEN);
- } else {
- /* 'name' is too long and we have no workaround. */
- VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
- "%d bytes", name, MAX_UN_LEN);
+/* 'host_index' is 0 if the host precedes the port within 's', 1 otherwise. */
+static void
+inet_parse_tokens__(char *s, int host_index, char **hostp, char **portp)
+{
+ char *colon = NULL;
+ bool in_brackets = false;
+ int n_colons = 0;
+ for (char *p = s; *p; p++) {
+ if (*p == '[') {
+ in_brackets = true;
+ } else if (*p == ']') {
+ in_brackets = false;
+ } else if (*p == ':' && !in_brackets) {
+ n_colons++;
+ colon = p;
}
+ }
- return ENAMETOOLONG;
+ *hostp = *portp = NULL;
+ if (n_colons > 1) {
+ *hostp = s;
} else {
- make_sockaddr_un__(name, un, un_len);
- return 0;
+ char **tokens[2];
+ tokens[host_index] = hostp;
+ tokens[!host_index] = portp;
+
+ if (colon) {
+ *colon = '\0';
+ *tokens[1] = unbracket(colon + 1);
+ }
+ *tokens[0] = unbracket(s);
}
}
-/* Binds Unix domain socket 'fd' to a file with permissions 0700. */
-static int
-bind_unix_socket(int fd, struct sockaddr *sun, socklen_t sun_len)
+/* Parses 's', a string in the form "<host>[:<port>]", into its (required) host
+ * and (optional) port components, and stores pointers to them in '*hostp' and
+ * '*portp' respectively. Always sets '*hostp' nonnull, although possibly to
+ * an empty string. Can set '*portp' to the null string.
+ *
+ * Supports both IPv4 and IPv6. IPv6 addresses may be quoted with square
+ * brackets. Resolves ambiguous cases that might represent an IPv6 address or
+ * an IPv6 address and a port as representing just a host, e.g. "::1:2:3:4:80"
+ * is a host but "[::1:2:3:4]:80" is a host and a port.
+ *
+ * Modifies 's' and points '*hostp' and '*portp' (if nonnull) into it.
+ */
+void
+inet_parse_host_port_tokens(char *s, char **hostp, char **portp)
{
- /* According to _Unix Network Programming_, umask should affect bind(). */
- mode_t old_umask = umask(0077);
- int error = bind(fd, sun, sun_len) ? errno : 0;
- umask(old_umask);
- return error;
+ inet_parse_tokens__(s, 0, hostp, portp);
}
-/* Creates a Unix domain socket in the given 'style' (either SOCK_DGRAM or
- * SOCK_STREAM) that is bound to '*bind_path' (if 'bind_path' is non-null) and
- * connected to '*connect_path' (if 'connect_path' is non-null). If 'nonblock'
- * is true, the socket is made non-blocking. If 'passcred' is true, the socket
- * is configured to receive SCM_CREDENTIALS control messages.
+/* Parses 's', a string in the form "<port>[:<host>]", into its port and host
+ * components, and stores pointers to them in '*portp' and '*hostp'
+ * respectively. Either '*portp' and '*hostp' (but not both) can end up null.
*
- * Returns the socket's fd if successful, otherwise a negative errno value. */
-int
-make_unix_socket(int style, bool nonblock, bool passcred OVS_UNUSED,
- const char *bind_path, const char *connect_path)
+ * Supports both IPv4 and IPv6. IPv6 addresses may be quoted with square
+ * brackets. Resolves ambiguous cases that might represent an IPv6 address or
+ * an IPv6 address and a port as representing just a host, e.g. "::1:2:3:4:80"
+ * is a host but "[::1:2:3:4]:80" is a host and a port.
+ *
+ * Modifies 's' and points '*hostp' and '*portp' (if nonnull) into it.
+ */
+void
+inet_parse_port_host_tokens(char *s, char **portp, char **hostp)
{
- int error;
- int fd;
-
- fd = socket(PF_UNIX, style, 0);
- if (fd < 0) {
- return -errno;
- }
+ inet_parse_tokens__(s, 1, hostp, portp);
+}
- /* Set nonblocking mode right away, if we want it. This prevents blocking
- * in connect(), if connect_path != NULL. (In turn, that's a corner case:
- * it will only happen if style is SOCK_STREAM or SOCK_SEQPACKET, and only
- * if a backlog of un-accepted connections has built up in the kernel.) */
- if (nonblock) {
- int flags = fcntl(fd, F_GETFL, 0);
- if (flags == -1) {
- error = errno;
- goto error;
- }
- if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
- error = errno;
- goto error;
- }
+static bool
+parse_sockaddr_components_dns(struct sockaddr_storage *ss OVS_UNUSED,
+ char *host_s,
+ const char *port_s OVS_UNUSED,
+ uint16_t default_port OVS_UNUSED,
+ const char *s OVS_UNUSED)
+{
+ char *tmp_host_s;
+
+ dns_resolve(host_s, &tmp_host_s);
+ if (tmp_host_s != NULL) {
+ parse_sockaddr_components(ss, tmp_host_s, port_s,
+ default_port, s, false);
+ free(tmp_host_s);
+ return true;
}
+ return false;
+}
- if (bind_path) {
- struct sockaddr_un un;
- socklen_t un_len;
- int dirfd;
-
- if (unlink(bind_path) && errno != ENOENT) {
- VLOG_WARN("unlinking \"%s\": %s\n", bind_path, strerror(errno));
- }
- fatal_signal_add_file_to_unlink(bind_path);
+static bool
+parse_sockaddr_components(struct sockaddr_storage *ss,
+ char *host_s,
+ const char *port_s, uint16_t default_port,
+ const char *s,
+ bool resolve_host)
+{
+ struct sockaddr_in *sin = sin_cast(sa_cast(ss));
+ int port;
- error = make_sockaddr_un(bind_path, &un, &un_len, &dirfd);
- if (!error) {
- error = bind_unix_socket(fd, (struct sockaddr *) &un, un_len);
- }
- if (dirfd >= 0) {
- close(dirfd);
- }
- if (error) {
- goto error;
+ if (port_s && port_s[0]) {
+ if (!str_to_int(port_s, 10, &port) || port < 0 || port > 65535) {
+ VLOG_ERR("%s: bad port number \"%s\"", s, port_s);
+ goto exit;
}
+ } else {
+ port = default_port;
}
- if (connect_path) {
- struct sockaddr_un un;
- socklen_t un_len;
- int dirfd;
+ memset(ss, 0, sizeof *ss);
+ if (host_s && strchr(host_s, ':')) {
+ struct sockaddr_in6 *sin6 = sin6_cast(sa_cast(ss));
+ char *addr = strsep(&host_s, "%");
- error = make_sockaddr_un(connect_path, &un, &un_len, &dirfd);
- if (!error
- && connect(fd, (struct sockaddr*) &un, un_len)
- && errno != EINPROGRESS) {
- error = errno;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = htons(port);
+ if (!addr || !*addr || !ipv6_parse(addr, &sin6->sin6_addr)) {
+ goto exit;
}
- if (dirfd >= 0) {
- close(dirfd);
- }
- if (error) {
- goto error;
- }
- }
-#ifdef SCM_CREDENTIALS
- if (passcred) {
- int enable = 1;
- if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable))) {
- error = errno;
- goto error;
+#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
+ char *scope = strsep(&host_s, "%");
+ if (scope && *scope) {
+ if (!scope[strspn(scope, "0123456789")]) {
+ sin6->sin6_scope_id = atoi(scope);
+ } else {
+ sin6->sin6_scope_id = if_nametoindex(scope);
+ if (!sin6->sin6_scope_id) {
+ VLOG_ERR("%s: bad IPv6 scope \"%s\" (%s)",
+ s, scope, ovs_strerror(errno));
+ goto exit;
+ }
+ }
}
- }
#endif
-
- return fd;
-
-error:
- if (error == EAGAIN) {
- error = EPROTO;
- }
- if (bind_path) {
- fatal_signal_remove_file_to_unlink(bind_path);
+ } else {
+ sin->sin_family = AF_INET;
+ sin->sin_port = htons(port);
+ if (host_s && !ip_parse(host_s, &sin->sin_addr.s_addr)) {
+ goto resolve;
+ }
}
- close(fd);
- return -error;
-}
-int
-get_unix_name_len(socklen_t sun_len)
-{
- return (sun_len >= offsetof(struct sockaddr_un, sun_path)
- ? sun_len - offsetof(struct sockaddr_un, sun_path)
- : 0);
-}
+ return true;
-ovs_be32
-guess_netmask(ovs_be32 ip_)
-{
- uint32_t ip = ntohl(ip_);
- return ((ip >> 31) == 0 ? htonl(0xff000000) /* Class A */
- : (ip >> 30) == 2 ? htonl(0xffff0000) /* Class B */
- : (ip >> 29) == 6 ? htonl(0xffffff00) /* Class C */
- : htonl(0)); /* ??? */
+resolve:
+ if (resolve_host && parse_sockaddr_components_dns(ss, host_s, port_s,
+ default_port, s)) {
+ return true;
+ } else if (!resolve_host) {
+ VLOG_ERR("%s: bad IP address \"%s\"", s, host_s);
+ }
+exit:
+ memset(ss, 0, sizeof *ss);
+ return false;
}
/* Parses 'target', which should be a string in the format "<host>[:<port>]".
- * <host> is required. If 'default_port' is nonzero then <port> is optional
- * and defaults to 'default_port'.
+ * <host>, which is required, may be an IPv4 address or an IPv6 address
+ * enclosed in square brackets. If 'default_port' is nonnegative then <port>
+ * is optional and defaults to 'default_port' (use 0 to make the kernel choose
+ * an available port, although this isn't usually appropriate for active
+ * connections). If 'default_port' is negative, then <port> is required.
+ * It resolves the host if 'resolve_host' is true.
*
- * On success, returns true and stores the parsed remote address into '*sinp'.
- * On failure, logs an error, stores zeros into '*sinp', and returns false. */
+ * On success, returns true and stores the parsed remote address into '*ss'.
+ * On failure, logs an error, stores zeros into '*ss', and returns false. */
bool
-inet_parse_active(const char *target_, uint16_t default_port,
- struct sockaddr_in *sinp)
+inet_parse_active(const char *target_, int default_port,
+ struct sockaddr_storage *ss, bool resolve_host)
{
char *target = xstrdup(target_);
- char *save_ptr = NULL;
- const char *host_name;
- const char *port_string;
- bool ok = false;
-
- /* Defaults. */
- sinp->sin_family = AF_INET;
- sinp->sin_port = htons(default_port);
-
- /* Tokenize. */
- host_name = strtok_r(target, ":", &save_ptr);
- port_string = strtok_r(NULL, ":", &save_ptr);
- if (!host_name) {
- VLOG_ERR("%s: bad peer name format", target_);
- goto exit;
- }
-
- /* Look up IP, port. */
- if (lookup_ip(host_name, &sinp->sin_addr)) {
- goto exit;
- }
- if (port_string && atoi(port_string)) {
- sinp->sin_port = htons(atoi(port_string));
- } else if (!default_port) {
- VLOG_ERR("%s: port number must be specified", target_);
- goto exit;
+ char *port, *host;
+ bool ok;
+
+ inet_parse_host_port_tokens(target, &host, &port);
+ if (!host) {
+ VLOG_ERR("%s: host must be specified", target_);
+ ok = false;
+ } else if (!port && default_port < 0) {
+ VLOG_ERR("%s: port must be specified", target_);
+ ok = false;
+ } else {
+ ok = parse_sockaddr_components(ss, host, port, default_port,
+ target_, resolve_host);
}
-
- ok = true;
-
-exit:
if (!ok) {
- memset(sinp, 0, sizeof *sinp);
+ memset(ss, 0, sizeof *ss);
}
free(target);
return ok;
}
-/* Opens a non-blocking IPv4 socket of the specified 'style' and connects to
- * 'target', which should be a string in the format "<host>[:<port>]". <host>
- * is required. If 'default_port' is nonzero then <port> is optional and
- * defaults to 'default_port'.
+
+/* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style' and
+ * connects to 'target', which should be a string in the format
+ * "<host>[:<port>]". <host>, which is required, may be an IPv4 address or an
+ * IPv6 address enclosed in square brackets. If 'default_port' is nonnegative
+ * then <port> is optional and defaults to 'default_port'.
*
* 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
*
* into '*fdp'. On failure, returns a positive errno value other than EAGAIN
* and stores -1 into '*fdp'.
*
- * If 'sinp' is non-null, then on success the target address is stored into
- * '*sinp'. */
+ * If 'ss' is non-null, then on success stores the target address into '*ss'.
+ *
+ * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
+ * should be in the range [0, 63] and will automatically be shifted to the
+ * appropriately place in the IP tos field. */
int
-inet_open_active(int style, const char *target, uint16_t default_port,
- struct sockaddr_in *sinp, int *fdp)
+inet_open_active(int style, const char *target, int default_port,
+ struct sockaddr_storage *ssp, int *fdp, uint8_t dscp)
{
- struct sockaddr_in sin;
+ struct sockaddr_storage ss;
int fd = -1;
int error;
/* Parse. */
- if (!inet_parse_active(target, default_port, &sin)) {
+ if (!inet_parse_active(target, default_port, &ss, true)) {
error = EAFNOSUPPORT;
goto exit;
}
/* Create non-blocking socket. */
- fd = socket(AF_INET, style, 0);
+ fd = socket(ss.ss_family, style, 0);
if (fd < 0) {
- VLOG_ERR("%s: socket: %s", target, strerror(errno));
- error = errno;
+ error = sock_errno();
+ VLOG_ERR("%s: socket: %s", target, sock_strerror(error));
goto exit;
}
error = set_nonblocking(fd);
if (error) {
- goto exit_close;
+ goto exit;
+ }
+
+ /* The dscp bits must be configured before connect() to ensure that the
+ * TOS field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, ss.ss_family, dscp);
+ if (error) {
+ VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error));
+ goto exit;
}
/* Connect. */
- error = connect(fd, (struct sockaddr *) &sin, sizeof sin) == 0 ? 0 : errno;
- if (error == EINPROGRESS) {
+ error = connect(fd, (struct sockaddr *) &ss, ss_length(&ss)) == 0
+ ? 0
+ : sock_errno();
+ if (error == EINPROGRESS
+#ifdef _WIN32
+ || error == WSAEALREADY || error == WSAEWOULDBLOCK
+#endif
+ ) {
error = EAGAIN;
- } else if (error && error != EAGAIN) {
- goto exit_close;
}
- /* Success: error is 0 or EAGAIN. */
- goto exit;
-
-exit_close:
- close(fd);
exit:
- if (!error || error == EAGAIN) {
- if (sinp) {
- *sinp = sin;
+ if (error && error != EAGAIN) {
+ if (ssp) {
+ memset(ssp, 0, sizeof *ssp);
+ }
+ if (fd >= 0) {
+ closesocket(fd);
+ fd = -1;
}
- *fdp = fd;
} else {
- *fdp = -1;
+ if (ssp) {
+ *ssp = ss;
+ }
}
+ *fdp = fd;
return error;
}
-/* Parses 'target', which should be a string in the format "[<port>][:<ip>]":
+/* Parses 'target', which should be a string in the format "[<port>][:<host>]":
*
* - If 'default_port' is -1, then <port> is required. Otherwise, if
* <port> is omitted, then 'default_port' is used instead.
* - If <port> (or 'default_port', if used) is 0, then no port is bound
* and the TCP/IP stack will select a port.
*
- * - If <ip> is omitted then the IP address is wildcarded.
+ * - <host> is optional. If supplied, it may be an IPv4 address or an
+ * IPv6 address enclosed in square brackets. If omitted, the IP address
+ * is wildcarded.
*
- * If successful, stores the address into '*sinp' and returns true; otherwise
- * zeros '*sinp' and returns false. */
+ * If successful, stores the address into '*ss' and returns true; otherwise
+ * zeros '*ss' and returns false. */
bool
-inet_parse_passive(const char *target_, uint16_t default_port,
- struct sockaddr_in *sinp)
+inet_parse_passive(const char *target_, int default_port,
+ struct sockaddr_storage *ss)
{
char *target = xstrdup(target_);
- char *string_ptr = target;
- const char *host_name;
- const char *port_string;
- bool ok = false;
- int port;
-
- /* Address defaults. */
- memset(sinp, 0, sizeof *sinp);
- sinp->sin_family = AF_INET;
- sinp->sin_addr.s_addr = htonl(INADDR_ANY);
- sinp->sin_port = htons(default_port);
-
- /* Parse optional port number. */
- port_string = strsep(&string_ptr, ":");
- if (port_string && str_to_int(port_string, 10, &port)) {
- sinp->sin_port = htons(port);
- } else if (default_port < 0) {
- VLOG_ERR("%s: port number must be specified", target_);
- goto exit;
- }
+ char *port, *host;
+ bool ok;
- /* Parse optional bind IP. */
- host_name = strsep(&string_ptr, ":");
- if (host_name && host_name[0] && lookup_ip(host_name, &sinp->sin_addr)) {
- goto exit;
+ inet_parse_port_host_tokens(target, &port, &host);
+ if (!port && default_port < 0) {
+ VLOG_ERR("%s: port must be specified", target_);
+ ok = false;
+ } else {
+ ok = parse_sockaddr_components(ss, host, port, default_port,
+ target_, true);
}
-
- ok = true;
-
-exit:
if (!ok) {
- memset(sinp, 0, sizeof *sinp);
+ memset(ss, 0, sizeof *ss);
}
free(target);
return ok;
}
-/* Opens a non-blocking IPv4 socket of the specified 'style', binds to
+/* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style', binds to
* 'target', and listens for incoming connections. Parses 'target' in the same
* way was inet_parse_passive().
*
* On success, returns a non-negative file descriptor. On failure, returns a
* negative errno value.
*
- * If 'sinp' is non-null, then on success the bound address is stored into
- * '*sinp'. */
+ * If 'ss' is non-null, then on success stores the bound address into '*ss'.
+ *
+ * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
+ * should be in the range [0, 63] and will automatically be shifted to the
+ * appropriately place in the IP tos field.
+ *
+ * If 'kernel_print_port' is true and the port is dynamically assigned by
+ * the kernel, print the chosen port. */
int
inet_open_passive(int style, const char *target, int default_port,
- struct sockaddr_in *sinp)
+ struct sockaddr_storage *ssp, uint8_t dscp,
+ bool kernel_print_port)
{
- struct sockaddr_in sin;
+ bool kernel_chooses_port;
+ struct sockaddr_storage ss;
int fd = 0, error;
unsigned int yes = 1;
- if (!inet_parse_passive(target, default_port, &sin)) {
- return EAFNOSUPPORT;
+ if (!inet_parse_passive(target, default_port, &ss)) {
+ return -EAFNOSUPPORT;
}
+ kernel_chooses_port = ss_get_port(&ss) == 0;
/* Create non-blocking socket, set SO_REUSEADDR. */
- fd = socket(AF_INET, style, 0);
+ fd = socket(ss.ss_family, style, 0);
if (fd < 0) {
- error = errno;
- VLOG_ERR("%s: socket: %s", target, strerror(error));
- return error;
+ error = sock_errno();
+ VLOG_ERR("%s: socket: %s", target, sock_strerror(error));
+ return -error;
}
error = set_nonblocking(fd);
if (error) {
}
if (style == SOCK_STREAM
&& setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
- error = errno;
- VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", target, strerror(error));
+ error = sock_errno();
+ VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s",
+ target, sock_strerror(error));
goto error;
}
/* Bind. */
- if (bind(fd, (struct sockaddr *) &sin, sizeof sin) < 0) {
- error = errno;
- VLOG_ERR("%s: bind: %s", target, strerror(error));
+ if (bind(fd, (struct sockaddr *) &ss, ss_length(&ss)) < 0) {
+ error = sock_errno();
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_ERR_RL(&rl, "%s: bind: %s", target, sock_strerror(error));
+ goto error;
+ }
+
+ /* The dscp bits must be configured before connect() to ensure that the TOS
+ * field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, ss.ss_family, dscp);
+ if (error) {
+ VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error));
goto error;
}
/* Listen. */
- if (listen(fd, 10) < 0) {
- error = errno;
- VLOG_ERR("%s: listen: %s", target, strerror(error));
+ if (style == SOCK_STREAM && listen(fd, 10) < 0) {
+ error = sock_errno();
+ VLOG_ERR("%s: listen: %s", target, sock_strerror(error));
goto error;
}
- if (sinp) {
- socklen_t sin_len = sizeof sin;
- if (getsockname(fd, (struct sockaddr *) &sin, &sin_len) < 0){
- error = errno;
- VLOG_ERR("%s: getsockname: %s", target, strerror(error));
+ if (ssp || kernel_chooses_port) {
+ socklen_t ss_len = sizeof ss;
+ if (getsockname(fd, (struct sockaddr *) &ss, &ss_len) < 0) {
+ error = sock_errno();
+ VLOG_ERR("%s: getsockname: %s", target, sock_strerror(error));
goto error;
}
- if (sin.sin_family != AF_INET || sin_len != sizeof sin) {
- VLOG_ERR("%s: getsockname: invalid socket name", target);
- goto error;
+ if (kernel_chooses_port && kernel_print_port) {
+ VLOG_INFO("%s: listening on port %"PRIu16,
+ target, ss_get_port(&ss));
+ }
+ if (ssp) {
+ *ssp = ss;
}
- *sinp = sin;
}
return fd;
error:
- close(fd);
- return error;
+ if (ssp) {
+ memset(ssp, 0, sizeof *ssp);
+ }
+ closesocket(fd);
+ return -error;
}
-/* Returns a readable and writable fd for /dev/null, if successful, otherwise
- * a negative errno value. The caller must not close the returned fd (because
- * the same fd will be handed out to subsequent callers). */
-int
-get_null_fd(void)
+/* Parses 'target', which may be an IPv4 address or an IPv6 address
+ * enclosed in square brackets.
+ *
+ * On success, returns true and stores the parsed remote address into '*ss'.
+ * On failure, logs an error, stores zeros into '*ss', and returns false. */
+bool
+inet_parse_address(const char *target_, struct sockaddr_storage *ss)
{
- static int null_fd = -1;
- if (null_fd < 0) {
- null_fd = open("/dev/null", O_RDWR);
- if (null_fd < 0) {
- int error = errno;
- VLOG_ERR("could not open /dev/null: %s", strerror(error));
- return -error;
- }
+ char *target = xstrdup(target_);
+ char *host = unbracket(target);
+ bool ok = parse_sockaddr_components(ss, host, NULL, 0, target_, false);
+ if (!ok) {
+ memset(ss, 0, sizeof *ss);
}
- return null_fd;
+ free(target);
+ return ok;
}
int
fsync_parent_dir(const char *file_name)
{
int error = 0;
+#ifndef _WIN32
char *dir;
int fd;
* really an error. */
} else {
error = errno;
- VLOG_ERR("%s: fsync failed (%s)", dir, strerror(error));
+ VLOG_ERR("%s: fsync failed (%s)", dir, ovs_strerror(error));
}
}
close(fd);
} else {
error = errno;
- VLOG_ERR("%s: open failed (%s)", dir, strerror(error));
+ VLOG_ERR("%s: open failed (%s)", dir, ovs_strerror(error));
}
free(dir);
+#endif
return error;
}
}
}
-void
-xpipe(int fds[2])
-{
- if (pipe(fds)) {
- VLOG_FATAL("failed to create pipe (%s)", strerror(errno));
- }
-}
-
static int
-getsockopt_int(int fd, int level, int optname, int *valuep)
+getsockopt_int(int fd, int level, int option, const char *optname, int *valuep)
{
- socklen_t len = sizeof *valuep;
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
+ socklen_t len;
+ int value;
+ int error;
+
+ len = sizeof value;
+ if (getsockopt(fd, level, option, &value, &len)) {
+ error = sock_errno();
+ VLOG_ERR_RL(&rl, "getsockopt(%s): %s", optname, sock_strerror(error));
+ } else if (len != sizeof value) {
+ error = EINVAL;
+ VLOG_ERR_RL(&rl, "getsockopt(%s): value is %u bytes (expected %"PRIuSIZE")",
+ optname, (unsigned int) len, sizeof value);
+ } else {
+ error = 0;
+ }
- return (getsockopt(fd, level, optname, valuep, &len) ? errno
- : len == sizeof *valuep ? 0
- : EINVAL);
+ *valuep = error ? 0 : value;
+ return error;
}
static void
socklen_t len = sizeof ss;
if (!getaddr(fd, (struct sockaddr *) &ss, &len)) {
- if (ss.ss_family == AF_INET) {
- struct sockaddr_in sin;
-
- memcpy(&sin, &ss, sizeof sin);
- ds_put_format(string, IP_FMT":%"PRIu16,
- IP_ARGS(&sin.sin_addr.s_addr), ntohs(sin.sin_port));
+ if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6) {
+ ss_format_address(&ss, string);
+ ds_put_format(string, ":%"PRIu16, ss_get_port(&ss));
+#ifndef _WIN32
} else if (ss.ss_family == AF_UNIX) {
struct sockaddr_un sun;
const char *null;
null = memchr(sun.sun_path, '\0', maxlen);
ds_put_buffer(string, sun.sun_path,
null ? null - sun.sun_path : maxlen);
+#endif
}
#ifdef HAVE_NETLINK
else if (ss.ss_family == AF_NETLINK) {
#define SO_PROTOCOL 38
#endif
- if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, &protocol)) {
+ if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, "SO_PROTOCOL",
+ &protocol)) {
switch (protocol) {
case NETLINK_ROUTE:
ds_put_cstr(string, "NETLINK_ROUTE");
}
}
#endif
-#if AF_PACKET && __linux__
+#if __linux__
else if (ss.ss_family == AF_PACKET) {
struct sockaddr_ll sll;
struct stat s;
ds_init(&string);
+#ifndef _WIN32
if (fstat(fd, &s)) {
- ds_put_format(&string, "fstat failed (%s)", strerror(errno));
+ ds_put_format(&string, "fstat failed (%s)", ovs_strerror(errno));
} else if (S_ISSOCK(s.st_mode)) {
describe_sockaddr(&string, fd, getsockname);
ds_put_cstr(&string, "<->");
put_fd_filename(&string, fd);
#endif
}
+#else
+ ds_put_format(&string,"file descriptor");
+#endif /* _WIN32 */
return ds_steal_cstr(&string);
}
+\f
+/* sockaddr helpers. */
+
+static struct sockaddr_in *
+sin_cast(const struct sockaddr *sa)
+{
+ return ALIGNED_CAST(struct sockaddr_in *, sa);
+}
+
+static struct sockaddr_in6 *
+sin6_cast(const struct sockaddr *sa)
+{
+ return ALIGNED_CAST(struct sockaddr_in6 *, sa);
+}
+
+/* Returns true if 'sa' represents an IPv4 or IPv6 address, false otherwise. */
+bool
+sa_is_ip(const struct sockaddr *sa)
+{
+ return sa->sa_family == AF_INET || sa->sa_family == AF_INET6;
+}
+
+/* Returns the IPv4 or IPv6 address in 'sa'. Returns IPv4 addresses as
+ * v6-mapped. */
+struct in6_addr
+sa_get_address(const struct sockaddr *sa)
+{
+ ovs_assert(sa_is_ip(sa));
+ return (sa->sa_family == AF_INET
+ ? in6_addr_mapped_ipv4(sin_cast(sa)->sin_addr.s_addr)
+ : sin6_cast(sa)->sin6_addr);
+}
+
+/* Returns the IPv4 or IPv6 port in 'sa'. */
+uint16_t
+sa_get_port(const struct sockaddr *sa)
+{
+ ovs_assert(sa_is_ip(sa));
+ return ntohs(sa->sa_family == AF_INET
+ ? sin_cast(sa)->sin_port
+ : sin6_cast(sa)->sin6_port);
+}
+
+/* Returns true if 'name' is safe to include inside a network address field.
+ * We want to avoid names that include confusing punctuation, etc. */
+static bool OVS_UNUSED
+is_safe_name(const char *name)
+{
+ if (!name[0] || isdigit((unsigned char) name[0])) {
+ return false;
+ }
+ for (const char *p = name; *p; p++) {
+ if (!isalnum((unsigned char) *p) && *p != '-' && *p != '_') {
+ return false;
+ }
+ }
+ return true;
+}
+
+static void
+sa_format_address__(const struct sockaddr *sa,
+ const char *lbrack, const char *rbrack,
+ struct ds *s)
+{
+ ovs_assert(sa_is_ip(sa));
+ if (sa->sa_family == AF_INET) {
+ ds_put_format(s, IP_FMT, IP_ARGS(sin_cast(sa)->sin_addr.s_addr));
+ } else {
+ const struct sockaddr_in6 *sin6 = sin6_cast(sa);
+
+ ds_put_cstr(s, lbrack);
+ ds_reserve(s, s->length + INET6_ADDRSTRLEN);
+ char *tail = &s->string[s->length];
+ inet_ntop(AF_INET6, sin6->sin6_addr.s6_addr, tail, INET6_ADDRSTRLEN);
+ s->length += strlen(tail);
+
+#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
+ uint32_t scope = sin6->sin6_scope_id;
+ if (scope) {
+ char namebuf[IF_NAMESIZE];
+ char *name = if_indextoname(scope, namebuf);
+ ds_put_char(s, '%');
+ if (name && is_safe_name(name)) {
+ ds_put_cstr(s, name);
+ } else {
+ ds_put_format(s, "%"PRIu32, scope);
+ }
+ }
+#endif
+
+ ds_put_cstr(s, rbrack);
+ }
+}
+
+/* Formats the IPv4 or IPv6 address in 'sa' into 's'. If 'sa' is an IPv6
+ * address, puts square brackets around the address. */
+void
+sa_format_address(const struct sockaddr *sa, struct ds *s)
+{
+ sa_format_address__(sa, "[", "]", s);
+}
+
+/* Formats the IPv4 or IPv6 address in 'sa' into 's'. Does not add square
+ * brackets around IPv6 addresses. */
+void
+sa_format_address_nobracks(const struct sockaddr *sa, struct ds *s)
+{
+ sa_format_address__(sa, "", "", s);
+}
+
+size_t
+sa_length(const struct sockaddr *sa)
+{
+ switch (sa->sa_family) {
+ case AF_INET:
+ return sizeof(struct sockaddr_in);
+
+ case AF_INET6:
+ return sizeof(struct sockaddr_in6);
+
+ default:
+ OVS_NOT_REACHED();
+ }
+}
+\f
+/* sockaddr_storage helpers. */
+
+static const struct sockaddr *
+sa_cast(const struct sockaddr_storage *ss)
+{
+ return ALIGNED_CAST(const struct sockaddr *, ss);
+}
+
+bool
+ss_is_ip(const struct sockaddr_storage *ss)
+{
+ return sa_is_ip(sa_cast(ss));
+}
+
+uint16_t
+ss_get_port(const struct sockaddr_storage *ss)
+{
+ return sa_get_port(sa_cast(ss));
+}
+
+struct in6_addr
+ss_get_address(const struct sockaddr_storage *ss)
+{
+ return sa_get_address(sa_cast(ss));
+}
+
+void
+ss_format_address(const struct sockaddr_storage *ss, struct ds *s)
+{
+ sa_format_address(sa_cast(ss), s);
+}
+
+void
+ss_format_address_nobracks(const struct sockaddr_storage *ss, struct ds *s)
+{
+ sa_format_address_nobracks(sa_cast(ss), s);
+}
+
+size_t
+ss_length(const struct sockaddr_storage *ss)
+{
+ return sa_length(sa_cast(ss));
+}
+\f
+/* For Windows socket calls, 'errno' is not set. One has to call
+ * WSAGetLastError() to get the error number and then pass it to
+ * this function to get the correct error string.
+ *
+ * ovs_strerror() calls strerror_r() and would not get the correct error
+ * string for Windows sockets, but is good for POSIX. */
+const char *
+sock_strerror(int error)
+{
+#ifdef _WIN32
+ return ovs_format_message(error);
+#else
+ return ovs_strerror(error);
+#endif
+}
+\f
+#ifdef __linux__
+static int
+emulate_sendmmsg(int fd, struct mmsghdr *msgs, unsigned int n,
+ unsigned int flags)
+{
+ for (unsigned int i = 0; i < n; i++) {
+ ssize_t retval = sendmsg(fd, &msgs[i].msg_hdr, flags);
+ if (retval < 0) {
+ return i ? i : retval;
+ }
+ msgs[i].msg_len = retval;
+ }
+ return n;
+}
+
+#ifndef HAVE_SENDMMSG
+int
+sendmmsg(int fd, struct mmsghdr *msgs, unsigned int n, unsigned int flags)
+{
+ return emulate_sendmmsg(fd, msgs, n, flags);
+}
+#else
+/* sendmmsg was redefined in lib/socket-util.c, should undef sendmmsg here
+ * to avoid recursion */
+#undef sendmmsg
+int
+wrap_sendmmsg(int fd, struct mmsghdr *msgs, unsigned int n, unsigned int flags)
+{
+ static bool sendmmsg_broken = false;
+ if (!sendmmsg_broken) {
+ int save_errno = errno;
+ int retval = sendmmsg(fd, msgs, n, flags);
+ if (retval >= 0 || errno != ENOSYS) {
+ return retval;
+ }
+ sendmmsg_broken = true;
+ errno = save_errno;
+ }
+ return emulate_sendmmsg(fd, msgs, n, flags);
+}
+#endif
+
+static int
+emulate_recvmmsg(int fd, struct mmsghdr *msgs, unsigned int n,
+ int flags, struct timespec *timeout OVS_UNUSED)
+{
+ ovs_assert(!timeout); /* XXX not emulated */
+
+ bool waitforone = flags & MSG_WAITFORONE;
+ flags &= ~MSG_WAITFORONE;
+
+ for (unsigned int i = 0; i < n; i++) {
+ ssize_t retval = recvmsg(fd, &msgs[i].msg_hdr, flags);
+ if (retval < 0) {
+ return i ? i : retval;
+ }
+ msgs[i].msg_len = retval;
+
+ if (waitforone) {
+ flags |= MSG_DONTWAIT;
+ }
+ }
+ return n;
+}
+
+#ifndef HAVE_SENDMMSG
+int
+recvmmsg(int fd, struct mmsghdr *msgs, unsigned int n,
+ int flags, struct timespec *timeout)
+{
+ return emulate_recvmmsg(fd, msgs, n, flags, timeout);
+}
+#else
+/* recvmmsg was redefined in lib/socket-util.c, should undef recvmmsg here
+ * to avoid recursion */
+#undef recvmmsg
+int
+wrap_recvmmsg(int fd, struct mmsghdr *msgs, unsigned int n,
+ int flags, struct timespec *timeout)
+{
+ ovs_assert(!timeout); /* XXX not emulated */
+
+ static bool recvmmsg_broken = false;
+ if (!recvmmsg_broken) {
+ int save_errno = errno;
+ int retval = recvmmsg(fd, msgs, n, flags, timeout);
+ if (retval >= 0 || errno != ENOSYS) {
+ return retval;
+ }
+ recvmmsg_broken = true;
+ errno = save_errno;
+ }
+ return emulate_recvmmsg(fd, msgs, n, flags, timeout);
+}
+#endif
+#endif /* __linux__ */